Mongoose error problems connecting to mongodb

Question

I am trying to get mongoDB working alongside a phpMyAdmin database and i am getting an error message that i can't workout.

I would be a novice programmer so it could be a pretty basic error i have done somewhere. As far as i know i have installed all the correct dependencies and the error described comes up when i run nodemon server on my console.

const express = require("express")
const cors = require("cors")
const bodyParser = require("body-parser")
const app = express()
const mongoose = require('mongoose');

require('dotenv').config();

//server for the SQL database
const port = process.env.PORT || 5000

app.use(bodyParser.json())
app.use(cors())
app.use(bodyParser.urlencoded({extended: false}))

var Users = require('./routes/user.routes')

app.use('/users', Users)

app.listen(port, () => {
    console.log("Server is running on port: " + port)
})

// server for MongoDB database

app.use(cors());
app.use(express.json());

const uri = process.env.ATLAS_URI;

//console.log(uri)

mongoose.createConnection(uri, { useNewUrlParser: true, useCreateIndex: true }
);
const connection = mongoose.createConnection();
connection.once('open', () => {
    console.log("MongoDB database connection established successfully");
})

const formsRouter = require('./routes/formDatabase.routes');
const adviceRouter = require('./routes/studentAdvice.routes');

app.use('/formDatabase.routes', formsRouter);
app.use('/studentAdvice.routes', adviceRouter);

app.listen(port, () => {
    console.log(`Server is running on port: ${port}`);
});

[nodemon] restarting due to changes... [nodemon] starting node server backend/server/server.js (node:25800) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 exit listeners added to [Bus]. Use emitter.setMaxListeners() to increase limit

\\softwaredevproject\\cra-beacon\\node_modules\\mongoose\\lib\\connection.js:543 throw new MongooseError('The uri parameter to openUri() must be a ' + ^ Error [MongooseError]: The uri parameter to openUri() must be a string, got "undefined". Make sure the first parameter to mongoose.connect() or mongoose.createConnection( ) is a string. at new MongooseError ( \\softwaredevproject\\cra-beacon\\node_modules\\mongoose\\lib\\error\\mongooseError.js:10:11) at NativeConnection.Connection.openUri ( \\softwaredevproject\\cra-beacon\\node_modules\\mongoose\\lib\\connection.js:543:11) at Mongoose.createConnection ( \\softwaredevproject\\cra-beacon\\node_modules\\mongoose\\lib\\index.js:278:17) at Object. (***\\softwaredevproject\\cra-beacon\\backend\\server\\server.js:33:10) at Module._compile (internal/modules/cjs/loader.js:971:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1011:10) at Module.load (internal/modules/cjs/loader.js:822:32) at Function.Module._load (internal/modules/cjs/loader.js:730:14) a t Function.Module.runMain (internal/modules/cjs/loader.js:1051:12) at internal/main/run_main_module.js:16:11 { message: 'The uri parameter to openUri() must be a string, got "undefined". Make sure the first parameter to mongoose.connect() or mongoose.createConnection() is a str ing.', name: 'MongooseError' } [nodemon] app crashed - waiting for file changes before starting...

Answer 1

I think it's because of your environment settings, best guess the ATLAS_URI setting.

ATLAS_URI=mongodb://localhost/NAME

Since the error claims that nothing got passed, maybe you forgot to add this setting to your .env file?